Sorry all, sent this to only PHK by mistake. Now for benefit of the
list.
Bob L.
Sent: Tuesday, January 31, 2023 at 2:46 PM
From: "Robert LaJeunesse" lajeunesse@mail.com
To: "Poul-Henning Kamp" phk@phk.freebsd.dk
Subject: Re: [time-nuts] Re: Unobtanium bulbs for HP506x: Found 'em!
Poul-Henning,
I am under the impression from your link to the video that the Tec-Lite
bulb holder was used in the HP506x. (I'd check, but I don't normally
have access to one. Pix on the web didn't help.) If that is the case
check the attached picture, where the arrow points to a small gap
between the bulb flange and the threaded cover. Use a knife blade to
pry the bulb, which is not threaded, out of the cover.
If, in fact, the bulbs are T-1-3/4 screw base items there were few
standards produced. One good reference to what was available back then
is the Allied Radio catalog, which is online if you want the 1970
version. (see
[1]https://alliedcatalogs.com/flipbook/1970_allied_radio_catalog.html)
In that catalog page 342 lists a dozen bulbs midget flanged, but only
the 1768 and 1769 as screw based.
Hopefully having the right part number for the bulb helps in acquiring
what you need.
Bob L.
Sent: Tuesday, January 31, 2023 at 2:06 PM
From: "Poul-Henning Kamp" phk@phk.freebsd.dk
To: "Discussion of precise time and frequency measurement"
Cc: "Robert LaJeunesse" lajeunesse@mail.com
Subject: Re: [time-nuts] Re: Unobtanium bulbs for HP506x: Found 'em!
Robert LaJeunesse via time-nuts writes:
There are lots of this size bulb available, such
as: [2]https://www.ebay.com/itm/314217639000
But those dont have the threads necessary to screw them into
the lamp-holders on a HP5065 or HP5061 frequency standard.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by
Sorry all, sent this to only PHK by mistake. Now for benefit of the
list.
Bob L.
Sent: Tuesday, January 31, 2023 at 2:46 PM
From: "Robert LaJeunesse" <lajeunesse@mail.com>
To: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
Subject: Re: [time-nuts] Re: Unobtanium bulbs for HP506x: Found 'em!
Poul-Henning,
I am under the impression from your link to the video that the Tec-Lite
bulb holder was used in the HP506x. (I'd check, but I don't normally
have access to one. Pix on the web didn't help.) If that is the case
check the attached picture, where the arrow points to a small gap
between the bulb flange and the threaded cover. Use a knife blade to
pry the bulb, which is not threaded, out of the cover.
If, in fact, the bulbs are T-1-3/4 screw base items there were few
standards produced. One good reference to what was available back then
is the Allied Radio catalog, which is online if you want the 1970
version. (see
[1]https://alliedcatalogs.com/flipbook/1970_allied_radio_catalog.html)
In that catalog page 342 lists a dozen bulbs midget flanged, but only
the 1768 and 1769 as screw based.
Hopefully having the right part number for the bulb helps in acquiring
what you need.
Bob L.
> Sent: Tuesday, January 31, 2023 at 2:06 PM
> From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
> To: "Discussion of precise time and frequency measurement"
<time-nuts@lists.febo.com>
> Cc: "Robert LaJeunesse" <lajeunesse@mail.com>
> Subject: Re: [time-nuts] Re: Unobtanium bulbs for HP506x: Found 'em!
>
> --------
> Robert LaJeunesse via time-nuts writes:
>
> > There are lots of this size bulb available, such
> > as: [2]https://www.ebay.com/itm/314217639000
>
> But those dont have the threads necessary to screw them into
> the lamp-holders on a HP5065 or HP5061 frequency standard.
>
> --
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk@FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by
incompetence.
>
References
1. https://alliedcatalogs.com/flipbook/1970_allied_radio_catalog.html
2. https://www.ebay.com/itm/314217639000
